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Microchip Technology SMAJ4750E3/TR13
- Part No.:
- SMAJ4750E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4750E3/TR13.pdf
- Description:
- DIODE ZENER 27V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,569
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Product details
Overview
SMAJ4750E3/TR13 from SM Semiconductor is a 27 V, 5% tolerance Zener diode transient voltage suppressor in SMA (DO-214AC) package, rated for 2.0 W steady-state power dissipation, 68 mA maximum regulator current at 100°C, and 170 A peak surge current; used for overvoltage protection of I/O lines and power rails in industrial sensor interfaces.
For engineers reviewing the SMAJ4750E3/TR13 datasheet, SMAJ4750E3/TR13 pinout, SMAJ4750E3/TR13 application, or SMAJ4750E3/TR13 equivalent, key selection criteria include breakdown voltage tolerance, thermal resistance (25°C/W), reverse leakage at rated voltage (5 µA @ 20.6 V), surge current capability, and ROHS-compliant matte-tin plating for reliable solderability.
Technical Context
This device operates as a silicon planar Zener diode optimized for transient suppression, with a sharp breakdown knee verified by dual-point Zener impedance measurement at 10% IZT AC superposition. Its 27 V nominal breakdown is specified at 9.5 mA test current with 35 Ω dynamic impedance.
Designed for unidirectional clamping, it features cathode-band polarity marking, void-free UL94V-0 epoxy encapsulation, and thermal performance validated under steady-state junction-to-lead conditions (RθJL = 25°C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 27.0 V ±5% at 9.5 mA - defines precise clamping threshold for 24 V rail protection |
| Power Dissipation PM(AV) | 2.0 W - supports continuous regulation without heatsink in low-power I/O circuits |
| Peak Surge Current Izsm | 170 A - withstands 1/2-sine 120 Hz transients per MIL-STD-750 Method 3013 |
| Reverse Leakage IR | 5 µA max @ 20.6 V - ensures minimal standby power loss in always-on sensor nodes |
| Dynamic Impedance ZZT | 35 Ω @ 9.5 mA - maintains tight voltage regulation during fast transient events |
| Thermal Resistance RθJL | 25 °C/W - enables direct lead-mount thermal path to PCB copper for reliability |
| Operating Temperature | –65 °C to +150 °C - qualified for under-hood automotive and industrial ambient extremes |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, cathode indicated by band, 0.3 g weight, ROHS-compliant matte-tin terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during forward bias / reference node during reverse clamp | Connected to protected circuit ground or low-side return path |
| Cathode | Clamping output node / high-impedance reference during regulation | Bonded to PCB trace carrying protected signal or supply rail; marked by band |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Ensures predictable clamping within ±1.35 V of 27 V nominal for deterministic overvoltage design margins |
| 2.0 W steady-state rating | Supports sustained energy absorption in DC-biased protection paths without derating below 100°C |
| UL94V-0 void-free epoxy case | Provides flame-retardant mechanical integrity and moisture resistance in harsh environments |
| ROHS-compliant matte-tin plating | Guarantees solder wetting >95% per MIL-STD-750 Method 2026 for automated assembly yield |
| 170 A peak surge capability | Meets IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly routed and decoupled |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 24 V CAN transceiver I/O pins from load-dump and inductive switching transients in factory automation PLCs. IC Role / Device Role / Timing Role: Unidirectional voltage clamp placed between signal line and ground, activated only during overvoltage events. Use Value: Limits transient excursions to ≤20.6 V (VR), preventing latch-up or damage to 3.3 V logic buffers downstream. | Use Scenario: Safeguarding LIN bus slave node power input against battery reversal and jump-start surges. IC Role / Device Role / Timing Role: Primary overvoltage limiter on 12 V supply rail feeding microcontroller LDO input. Use Value: Absorbs 170 A surge energy without degradation, maintaining system uptime per ISO 7637-2 Pulse 5a requirements. |
| Telecom Power Supply Input | Consumer Appliance Motor Driver |
Use Scenario: Secondary-stage clamping on 24 V telecom rectifier output exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Fast-response shunt protector operating in avalanche breakdown mode. Use Value: Clamps within 100 ns to 20.6 V, limiting stress on downstream DC-DC converter MOSFETs. | Use Scenario: Overvoltage suppression on H-bridge gate driver supply in smart washing machine motor control. IC Role / Device Role / Timing Role: Standby-mode regulator and transient suppressor on 15 V auxiliary rail. Use Value: Maintains stable 27 V reference across –40 °C to +125 °C, enabling consistent gate drive timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5365B | Same 27 V nominal, but DO-41 package (axial lead); higher RθJA (65°C/W vs 25°C/W) | Limited to lower-power through-hole designs; unsuitable for high-density SMT layouts | Prefer SMAJ4750E3/TR13 for space-constrained PCBs requiring superior thermal coupling |
| SZ1SMA4750HE3-TP | Identical SMA package and 27 V/5% spec, but from Diodes Inc.; same 170 A surge rating | Drop-in replacement with identical footprint and electrical behavior | Valid alternative when dual-sourcing or managing supply chain risk without redesign |
Compared with 1N5365B and SZ1SMA4750HE3-TP, SMAJ4750E3/TR13 offers optimal thermal performance in SMT form factor, while SZ1SMA4750HE3-TP provides seamless second-source compatibility, and 1N5365B suits legacy axial-leaded assemblies where board real estate is not constrained.
Availability
SMAJ4750E3/TR13 is available at Aetrix Electronics and suitable for industrial sensor interface, automotive body control module, and telecom power supply input applications requiring stable component supply and long-term production continuity.
Supply support for SMAJ4750E3/TR13 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
SM Semiconductor is a Taiwan-based manufacturer specializing in discrete semiconductor components including Zener diodes, TVS devices, and rectifiers for industrial and automotive markets.
The SMAJ47xxA series is engineered specifically for robust transient voltage suppression in high-reliability power and signal line protection, emphasizing tight voltage tolerance, repeatable surge endurance, and RoHS-compliant manufacturability.
FAQ
What is the Zener voltage tolerance of SMAJ4750E3/TR13?
SMAJ4750E3/TR13 has a ±5% Zener voltage tolerance, meaning its breakdown voltage is guaranteed between 25.65 V and 28.35 V at 9.5 mA test current. This tighter tolerance than standard 10% parts allows more precise overvoltage threshold setting in safety-critical 24 V systems. The 'A' suffix in the full family designation confirms this 5% grade, and the value is validated per Table 1 in the official SM Semiconductor datasheet.
How does SMAJ4750E3/TR13 differ from SMAJ4750A?
SMAJ4750E3/TR13 and SMAJ4750A share identical electrical specifications and SMA package, but SMAJ4750E3/TR13 denotes tape-and-reel packaging (TR13 = 13-inch reel) with RoHS compliance and matte-tin plating per MIL-STD-750 Method 2026. SMAJ4750A may refer to bulk or alternate packaging without guaranteed RoHS status. Both function identically in circuit, but SMAJ4750E3/TR13 is optimized for automated SMT assembly.
What is the maximum allowable reverse voltage (VR) for SMAJ4750E3/TR13 before significant leakage occurs?
The maximum reverse voltage VR for SMAJ4750E3/TR13 is 20.6 V, at which point reverse leakage current is guaranteed ≤5 µA. This value is derived from the 77% rule (0.77 × 27 V) and appears in Table 1 as the rated voltage for IR testing. Operating above 20.6 V risks exponential leakage rise and potential thermal runaway, so design margins must keep steady-state reverse bias strictly below this limit.
Can SMAJ4750E3/TR13 be used in bidirectional transient suppression?
No, SMAJ4750E3/TR13 is a unidirectional Zener diode intended only for single-polarity clamping. It conducts in reverse breakdown above 27 V but blocks only up to ~1.2 V in forward bias. For bidirectional protection (e.g., data lines), a pair of SMAJ4750E3/TR13 devices in series opposition or a dedicated bidirectional TVS like SMBJ26CA would be required. Using SMAJ4750E3/TR13 alone on AC-coupled signals risks forward conduction damage.
What is the thermal resistance junction-to-lead (RθJL) for SMAJ4750E3/TR13, and why does it matter?
SMAJ4750E3/TR13 has a specified RθJL of 25°C/W, measured from die junction to soldered lead termination. This low value enables efficient heat transfer directly into PCB copper, allowing sustained 2.0 W operation without external heatsinking-critical for compact industrial modules. Higher RθJA values (e.g., 65°C/W for DO-41 parts) would require derating above 70°C ambient, whereas SMAJ4750E3/TR13 maintains full rating up to 100°C case temperature.
SMAJ4750E3/TR13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±10%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 35 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 20.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC
SMAJ4750E3/TR13 FAQ
1.How can I place an order for SMAJ4750E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4750E3/TR13 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMAJ4750E3/TR13 reliable?
The price and inventory of SMAJ4750E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4750E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4750E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4750E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4750E3/TR13?
SMAJ4750E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4750E3/TR13 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMAJ4750E3/TR13?
For technical support, including SMAJ4750E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4750E3/TR13 requirements.
6.How does Aetrix verify that SMAJ4750E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4750E3/TR13 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMAJ4750E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4750E3/TR13?
All SMAJ4750E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4750E3/TR13, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMAJ4750E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4750E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4750E3/TR13 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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